Rough rounding machine



y 27, 1952 J. P. FREDERICKSEN v 2,597,983

ROUGH ROUNDING MACHINE Filed Nov. 8, 1949 5* 46462 a? Z fa Rvenfor:

James P H'eaer/bksen Patented May 27, 1952 ROUGH ROUNDING. MACHINE JamesP. Fredericksen, Braintree,.Mass., assignor to United Shoe MachineryCorporatiomFlemington, N. J., a corporation of New Jersey ApplicationNovember 8, 1949, Serial No. 126,155

8 Claims. 1

This invention relates to sole rounding, machines and, moreparticularly, is intended to improve the cutting action of machines ofthe type disclosed in United States Letters Patent 1,030,- 606, grantedon June 25, 1912 upon an application of F. H. Perry. Machines of theabove class, as usually constructed, are provided with a reciprocatingchopping knife which makes a series of overlapping cuts through theouter sole of a shoe, along a line corresponding to the desired contourof the sole edge; preparatory to the outsole stitching and V edgetrimming operations. The shoe is supported against the thrust of theknife, during this. socalledrough rounding operation, by an anvil whichthe-knife, when in proper adjustment, just meets at the end of itscutting stroke.

Because of the necessary bearing clearances in the knife drivingmechanism and variations in thehardness of the sole material the knifemay at-the end of certain strokes stop short of the anvil. At the end ofother strokes the knife may slightly penetrate the anvil so as to leavea shallow trace of the knife edge in the anvil, therebyincreasing thepossibility that succeeding'cuts f the knife will not extend completelythrough the sole. In such a case, the rough rounded sole edge will havea fringe extending from it which interferes with the proper guidance ofthe work during the outsole stitching and edge trimming operations.Moreover, even though the abovementioned irregularity in the stroke ofthe knife is hardly measurable, the anvilbecomes so worn that frequentreadjustment of the knife and replacement of the anvil are necessary toinsure'complete severance of the. sole.

Accordingly, one object of the inventionis to provide novel and improvedknife driving mechanism, ina sole rounding machine, with a view toinsuring: complete severanceof the sole materialatthe end of everycutting stroke of the knife and minimizing, as far aspossible,.readjustment of the knife and replacement of the To this end,and inaccordance with one feature of -the invention, the illustratedmachine includes with a carrierfortheknife, driving means which operatespositively during the initial portion of the cutting stroke of the knifeand until just beforeit reaches the-anvil, but thereafter. yieldinglyadvances the carrier to bring the knife into engagement with the anvilwhereby the cutting stroke of the knife is completed. ihus, the heavierand positively applied cutting force is expended before the knife canengage the anvil,

and the knife is finally brought into engagement with the anvil, toinsure a complete cut, by a yielding pressure so light that damage tothe anvil or knife is avoided.

This and otherfeatures of the invention, ex emplified in theconstruction and arrangement of the illustrated knife driving mechanism,will now be further described in detail with reference to theaccompanying drawings, and will be defined in the claims.

In the drawings,

Fig. 1 is a side elevation of a portion of an illustrative machineembodying the invention;

Fig. 2 is a sectional plan view, the section being taken at the level ofthe line II-II of Fig. 1; and

Fig. 3 is a perspective view of the knife carrier and its drivingmember, shown inexploded relation, and as viewed toward the front ofthemachine from theright-hand side thereof.

The drawings'illustrate a portion of the well:- known Goodyear UniversalRounding and Channeling Machine, this being the type of machine which isdisclosed in the above-mentionedPerry patent. Partsof the presentmachine which are like the corresponding parts inthe patented machinecomprise a chopping knife It, a feed point lzhaving at its lower end ananvil !4 against which the knife cuts, a bottom rest I 6 carryingachanneling knife it, a crease guide 23 and a forepart gage 22.

Further details of construction common to the present machine-and thePerry machine cause the knife ill-to be reciprocatedinto and out ofengagement with the anvil l4. These parts include a rotating drive shaft24 having a crank 26 rotatably mounted in its forward end, the axis ofthe crank being inclined to that of the drive shaft and intersecting itat 23. This crank'has a head 33 within which is clamped a rod 32, therod being journaled at each end in a driving member 3 5. This drivingmember has upper and lower trunnions 35, 38' which are mounted to pivotfreely, in a part of the frame in of the machine, about a verticalaxiswhich intersectsthe axis of the drive shaft at 28. The effect ofthiswellknown construction is to cause the driving-memher to oscillatehorizontally through a-predetermined stroke whenthe drive shaft isrotated.

The knife is is fixed upon a carrier 42, which is mounted to slidehorizontally in a slideway 44 formed in the'frame and is operated by theabovementioned driving member 34.

In prior machines of this type, such as that illustrated in the Perrypatent, thedriving connection .betweenthesknife, carrier .and itsdriving member is positive at all times, the construction and adjustmentof the machine being intended to cause the knife to be moved intoengagement with the anvil at the end of each of its cutting strokes.However, in the illustrated machine, the coacting parts of the drivingmember and knife carrier are specially constructed, in accordance withthe present invention, to cause the knife to be driven positivelythroughout the greater portion of its cutting stroke, and then to beyieldingly driven, through a very short terminal portion of this stroke,into engagement with the anvil. The following description will be:concerned with the structure by which this successively positive andyielding cutting action of the knife is obtained.

At the left-hand end of the driving member 34 there is formed a head 46having forward and rearward driving surfaces 48, 56, respectively,

which are cylindrical in form. The head 46 is received between lugs 52,54 having driving surfaces 56, 58 which cooperate with the surfaces 48,50, respectively, on the driving member.

It will be noted with reference to Fig. 2 that the outer half of theforward side of the head 46 is recessed to provide a vertical shoulder60, and that a similar shoulder 62 is formed on the righthand half ofthe lug 52. Throughout the greater portion of the strokes of the knifecarrier 42 and the driving member 34 they are positively con- ;v

nected because there is only the usual small clearance between the head46 and the surfaces 56, 58 which is necessary for their free running.However, toward the end of the cutting stroke of the knife, when it haspassed through the sole and lug 52, respectively. The head of the driv-I ing member 34 continues to move forwardly,

after the shoulders 60, 62 have passed off each other, so as not toprevent the knife from advancing into engagement with the anvil !4 underthe influence of the spring 64.

On the return stroke of the driving member 34,

the surface 50 on the head 46 bears against the lug 54 causing the knifeto be drawn positively out of the work. Very soon after this returnstroke starts the shoulders 60, 62 pass. across each other causing a.completely positive connection between the head and the knife carrier tobe reestablished, and this connection is maintained throughout theremainder of the return stroke and during the succeeding cutting strokeof the knife up to the time when the shoulders pass off each otheragain.

It is to be understood that the above described cycle of operation ofthe machine occurs normally at the rate of about one thousand perminute. The spring 64 is so designed as to provide sufficient drivingforce to insure that the knife will be driven completely through thework and yet will engage the anvil with only a light yielding pressure.Accordingly, in spite of minor variations in the relation of the partsof the knife driving mechanism, owing to bearing clearances or theresiliency of the parts, it is certain that the knife will be broughtlightly into engagement with the anvil at the end of each cuttingstroke, and that the complete severence of the chip from the shoe willbe efiected with a minimum of wear upon the anvil and knife.

Having described my invention what I claim as new and desire to secureby Letters Patent of the United States is.

1. In a sole rounding machine having an anvil, and a chopping knifemounted to move with alternate cutting and return strokes into and outof engagement with said anvil respectively, the combination with acarrier for the knife of means for driving said carrier positivelyduring the initial portion of the cutting action of said knife until itis about to engage said anvil, and means for thereafter driving saidcarrier yieldingly to bring said knife into engagement with said anvil.

2. In a sole rounding machine having an anvil, and a chopping knifemounted to move with alterhating cutting and return strokes into and outof engagement with said anvil respectively, the combination with acarrier for the knife movable toward and away from said anvil of anoscillating driving member, said member being constructed and arrangedto swing out of engagement with said carrier just before said knifeengages said anvil, and means connecting said driving member and saidcarrier for yieldingly completing the cutting stroke of said knife.

3. In a sole rounding machine, an anvil, a chopping knife, a knifecarrier mounted for movement in opposite, cutting and return strokes tocarry said knife into and out of engagement with said anvilrespectively, a driving member normally engaging said knife carrier andmounted for movement in a direction diverging with that of the cuttingstroke of said knife carrier, said member and knife carrier havingdriving surfaces which cooperate positively to drive the knife throughthe initial portion of its cutting stroke, said surfaces being arrangedto pass out of engagement with each other before said knife engages saidanvil, and a spring constructed and arranged to drive said knife carrierafter said surfaces have been disengaged to bring said knif yieldinglyinto engagement with said anvil.

4. In a sole rounding machine having an anvil, and a chopping knifemounted to move with alternate cutting and return strokes toward andaway from the anvil respectively, a carrier for said knife, a drivingmember for operating said carrier, said carrier having forward andrearward shoulders which cooperate with said driving member during thecutting and return strokes of said knife respectively, said drivingmember and said forward shoulder being constructed and arranged to moveout of engagement with each other toward the end of the cutting strokeof the knife whereby the positive driving relation between said drivingmember and said forward shoulders is interrupted before said knifeengages said anvil, and means for yieldingly acting upon said carrier tocomplete the cutting stroke of said knife.

5. In a sole rounding machine having an anvil, and a chopping knifemounted to move with alternate cutting and return strokes toward andaway from the anvil respectively, a knife-carrier, a member for drivingsaid carrier, said member and carrier having cooperating forward andrearward driving surfaces, each of said forward driving surfaces havinga shoulder arranged to pass by the other toward the end of the cuttingstroke of the knife whereby the positive driving relation between saidmember and carrier is interrupted, and a spring interposed between saidmember and said carrier for yieldingly completing the cutting strokeofthe knife.

6. In a sole rounding machine having an anvi], and a chopping knifemounted to move with alternate cutting and return strokes into and outOf engagement with the anvil, the combination with a carrier for theknife and a member for driving said carrier of means for connecting saidmember and carrier positively and yieldingly in succession during eachcutting stroke of the knife.

'7. In a sole rounding machine having an anvil, and a chopping knifemounted to move with alternate cutting and return strokes toward andaway from the anvil, the combination with a carrier for the knife of adriving member mounted to move out of engagement with said carriertoward the end of the cutting stroke of the knife, and means forthereafter yieldingly driving the knife into engagement with the anvil.

8. In a sole rounding machine having an anvil, and a chopping knifemounted to move with alternate cutting and return strokes toward andaway from the anvil, the combination with a carrier for the knife of adriving member mounted to move out of engagement with said carriertoward the end of the cutting stroke of th knife, and a springinterposed between said driving member and carrier for yieldinglycompleting the cutting stroke of the knife.

JAMES P. FREDERICKSEN.

REFERENCES CITED UNITED STATES PATENTS Name Date Litchfield Dec. 12,1916 Number

